Difficult Flatmate? An Australian Share House Guide to Trust, Safety, and Moving On

1. Have the actual conversation (yes, the one you've been avoiding)

Most share house conflict is the result of months of small grievances that never got said out loud. Dishes. Guests staying four nights a week. The thermostat. Whose turn it is to deal with the bin.

Before you start drafting an eviction letter in your head, try the thing nobody wants to do: sit down and have a direct, non-sarcastic conversation about what's not working. Not a text. Not a passive-aggressive fridge note. An actual conversation, in a neutral part of the house, ideally when neither of you has just got home from work.

Flatmates aren't mind readers. A surprising share of "difficult flatmate" situations turn out to be two reasonable people who never told each other what they needed.

2. Get house rules in writing before you need them

If you're currently in a share house with no written agreement between housemates, this one's for the future you of six months from now.

A simple one-page house agreement covering rent, bills, cleaning, guests, quiet hours, pets, and how you'll handle someone moving out does more to prevent difficult flatmate situations than any amount of good vibes. It's also the single best thing you can point to when something goes sideways, because "we agreed" is a stronger position than "I assumed."

You don't need a lawyer. A shared doc signed by everyone, even digitally, is fine.

3. Document what's happening, especially if it's escalating

If a flatmate's behaviour has moved past annoying and into concerning, start keeping notes. Dates, times, what happened, what was said. Screenshots of messages. Photos of damage.

You don't need to build a case file. You just need enough to reconstruct the timeline later if you end up talking to your landlord, a tenancy tribunal, a mediator, or in the worst cases, police. Relying on memory during a stressful situation is how small issues end up looking like your word against theirs.

4. Try mediation before you try anything else

Australia has decent, free, low-drama mediation services for share house disputes, and they are significantly underused.

In NSW, the Community Justice Centres run free mediation for housemate and neighbour disputes. Victoria has the Dispute Settlement Centre of Victoria. Queensland has the Dispute Resolution Centres. Most states have an equivalent service. A trained mediator in a room, or on a call, with both of you can unlock conversations that have been stuck for months.

This is particularly useful when the conflict is real but neither of you is unsafe, and neither of you wants to be the one to move out.

5. Know your tenancy rights in your state

Australian tenancy law is state-based, which means your rights as a flatmate depend significantly on where you live and how you're on the lease.

The broad categories are worth knowing:

• Co-tenants: everyone's on the lease. You have equal rights and equal responsibilities. Removing one co-tenant from the lease usually requires landlord or agent agreement and, in most cases, a new lease.
• Head-tenant and sub-tenant: one person holds the lease with the landlord and sub-lets rooms. The head-tenant has landlord-like responsibilities to the sub-tenants.
• Boarders and lodgers: the most informal arrangement, with the weakest tenancy protections, although general consumer and anti-discrimination law still applies.

Before you try to remove a housemate from the property, find out which category you're both in. The Tenants' Union in your state is the best starting point, and most offer free phone advice. In NSW, the Tenants' Union of NSW and Redfern Legal Centre are the go-to authorities.

6. Know the difference between annoying and unsafe

This is the most important line in this article, so read it twice.

Annoying flatmates can be worked around, talked to, mediated with, or eventually moved out from. Unsafe flatmates need a different response.

Unsafe includes: physical intimidation, threats, any form of assault, stalking-type behaviour, coercive control, tampering with your belongings in ways that affect your safety, entering your room without permission, controlling your access to the home, or any behaviour that makes you feel you cannot safely be in your own house.

If you're in that territory, the first call is not to your landlord. It's to 1800RESPECT on 1800 737 732 for confidential advice, or to police on 000 if there's an immediate threat. Everything else in this article assumes you're dealing with difficult, not dangerous.

7. Share the admin, not just the rent

A lot of share house friction is actually admin friction. Who paid the internet bill. Who's owed for the toilet paper. Whose turn it is to restock the dishwasher tablets. Whether the cleaner came last week or the week before.

The fix is boring and it works: use a shared tool for the shared stuff. A bill-splitting app for expenses. A shared calendar for bills and chores. A group chat for the house, separate from your individual chats. Getting the admin out of your head and into a shared system removes about a third of the things housemates fight about.

It also means that when you do end up in a disagreement, you're arguing about the substantive thing, not whether someone paid for the gas in June.

8. Have the "this isn't working" conversation

If you've had the conversation (point 1), tried mediation (point 4), checked your tenancy situation (point 5), and the co-living arrangement still isn't working, you're at the point most people avoid for three months too long: the explicit "this isn't working, one of us needs to move out" conversation.

Be clear. Be calm. Don't relitigate every grievance from the last six months. Say what you're asking for, whether that's them leaving, you leaving, or a deadline for things to change before one of you leaves.

In Australian share houses, this conversation works best when it includes a date. "By the end of next month" is a plan. "Soon" is a fight waiting to happen.

9. Leave properly, or ask them to

How you end a share house arrangement matters for your rental history, your bond, and your sanity.

If you're the one leaving: give written notice in line with your lease and state tenancy law. Get the bond arrangement in writing before the day you move out. Take photos of your room. Don't leave on a Friday night when the landlord is uncontactable. If it's a co-tenancy, make sure the paperwork actually comes off your name, because "I moved out" and "I'm no longer legally responsible for the lease" are not the same thing.

If you're asking them to leave: follow the right process for your tenancy category. For co-tenants, this usually requires either their agreement, landlord intervention, or tribunal involvement. For sub-tenants, the head-tenant has obligations to give proper notice. Trying to force someone out through harassment, locked doors, or removed belongings isn't just ugly. It's potentially unlawful, and it wrecks your position if things end up in front of a tribunal.

Clean break. Paperwork. Done.

10. Find a better fit next time

The best long-term protection against a difficult flatmate situation is better screening the next time around.

Meet in person, or at least on video, before you agree to anything. Ask about their last share house and why it ended. Look for housemates who ask you questions back, because the ones who don't tend to be the ones who won't communicate later either. Check references where you can. Use platforms that offer ID verification, so the person you're messaging online is actually the person who turns up on move-in day.

A bit of up-front friction at the matching stage saves you enormous amounts of pain at the living-together stage. Trust and safety in share accommodation is mostly built before the lease is signed, not after.

Frequently asked questions about difficult flatmates in Australia

Can I kick out a flatmate who isn't on the lease?

Not unilaterally. Even where someone is a boarder or lodger, there are notice requirements and the method matters. Contact your state Tenants' Union for the correct process before taking any action.

What if my flatmate is a co-tenant and refuses to leave?

You generally can't force a co-tenant out yourself. The usual paths are mutual agreement, landlord intervention, or a tribunal application. The Tenants' Union in your state can walk you through the specifics for your jurisdiction.

Is it legal to change the locks on a difficult flatmate?

In almost all Australian states and territories, no, not without proper process. Changing locks to exclude someone who has a legal right to be there can constitute unlawful eviction.

How much notice do I have to give to move out of a share house?

It depends on your state, your lease, and whether you're a co-tenant, sub-tenant, or boarder. As a general rule, 14 days written notice is the minimum you'll see in informal arrangements, and 21 to 28 days or more for formal leases, but check your state's tenancy legislation.

What counts as an unsafe flatmate situation?

Any situation involving threats, physical intimidation, stalking, coercive control, or behaviour that stops you safely being in your own home. In those situations, call 1800RESPECT on 1800 737 732 or, in immediate danger, 000.

Is co-living the same as a share house in Australia?

Not exactly. "Share house" is the traditional Australian arrangement where a group of people rent a property together. "Co-living" increasingly refers to purpose-built or professionally managed shared accommodation. The interpersonal dynamics, and most of the advice in this guide, apply to both.